ASTM_C_162_-_05_2015.pdf

Designation:C16205(Reapproved 2015)Standard Terminology ofGlass and Glass Products1This standard is issued under the fixed designation C162;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This terminology defines terms generally used in theglass industry.1.2 In some cases in which a usage is specific to a certainindustry,that is spelled out within the definition.For complete-ness and historical purposes,terms that are outdated are listedas being archaic.The reader is cautioned that some companiesor industries may define or use terms differently than the waythese terms are defined within this terminology.1.3 Other sources of glass glossaries are Glass Associationof North Americas Glazing Manual,2Engineering StandardsManual for Tempered Glass,2Laminated Glass Design Guide,2and ASTM Committee C-14 standards.2.Referenced Documents2.1 ASTM Standards:3C148 Test Methods for Polariscopic Examination of GlassContainersC336 Test Method for Annealing Point and Strain Point ofGlass by Fiber ElongationC338 Test Method for Softening Point of GlassC598 Test Method for Annealing Point and Strain Point ofGlass by Beam BendingC1048 Specification for Heat-Strengthened and Fully Tem-pered Flat GlassC1172 Specification for Laminated Architectural Flat Glass3.TerminologyAbb valuethe reciprocal dispersive power,a value used inoptical design,expressed mathematically as:Abbevalue5nd2 1!/nF2 nC!where ndis the refractive index for the helium line at587.6 nm and nFand nCare the refractive indices for thehydrogen lines at 486.1 and 656.3 nm,respectively.See syn-onymous term nu-value and related term dispersion.acid polishingthe polishing of a glass surface by acidtreatment.air bellsbubbles of irregular shape formed generally duringthe pressing or molding operations in the manufacture ofoptical glass.alabaster glassa milky-white glass that diffuses light with-out fiery color.alcovea narrow channel to convey molten glass from refinerto forehearth or to the revolving pot where it is gathered bythe Owens machine.alkalian industrial term for the oxide of sodium or potas-sium;less frequently of lithium.ampoulea glass container designed to be filled and sealed byfusion of the glass neck.annealto attain acceptably low stresses,or desired structure,or both,in glass by controlled cooling from a suitabletemperature.annealinga controlled cooling process for glass designed toreduce residual stress to a commercially acceptable level andmodify structure.annealing point(A.P.)that temperature corresponding eitherto a specific rate of elongation of a glass fiber whenmeasured by Test Method C336,or a specific rate ofmidpoint deflection of a glass beam when measured by TestMethod C598.At the annealing point of glass,internalstresses are substantially relieved in a matter of minutes.annealing rangethe range of glass temperature in whichstress in glass can be relieved at a commercially practicalrate.For purposes of comparing glasses,the annealing rangeis assumed to correspond with the temperature between theannealing point(A.P.)and the strain point(St.P.).antimonyan industrial term for an oxide of antimony.1This terminology is under the jurisdiction of ASTM Committee C14 on Glassand Glass Products and is the direct responsibility of Subcommittee C14.01 onNomenclature and Definitions.Current edition approved Nov.1,2015.Published November 2015.Originallyapproved in 1941.Last previous edition approved in 2010 as C162 05(2010).DOI:10.1520/C0162-05R15.2Available from Glass Association of North America(GANA),2945 SWWanamaker Drive,Ste A,Topeka,KS 66614-5321.http:/.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 arch,na part of a melter;a crown.arch,vto heat a pot in a pot arch.arrest markSee dwell mark.arsenican industrial term for an oxide of arsenic.aventurineglass containing colored,opaque spangles ofnonglassy material.back wallthe wall at the charging end of a melter.bafflea mold part used to close the delivery or baffle hole ina blank mold.baffle marka mark or seam on a bottle resulting from a moldjoint between blank mold and baffle.baffle walla wall used to deflect gases or flames in a melter.See shadow wall.baghousea chamber containing bag filters for the removal ofparticles from a process exhaust stream.baitthe tool dipped into molten glass to start any drawingoperation.barrel,glass containerarchaic See sidewall,glass con-tainer.basearchaic the bottom of a bottle.basic fiberunprocessed glass fibers directly from t